The average weight of a newborn baby is 6.4 pounds with standard deviation 1.2 pounds. If a baby girl weigh is in the 90th percentile how much does she weigh?
multiple choice:
a) 6.4
b) 12.8
c) 7.9
We assume that the weight is normally distributed.
Let X be the r.v denoting the weight of a new born baby.
Given
Now
Thus,
.
Now, So from Normal Distribution table we we get
So option C is correct
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